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But unlike that first shuttle flight, Ares I-X will be unmanned.

但与哥伦比亚号航天飞机的首次试飞不同，“战神i - X”是无人驾驶的。

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In 2011, the US space agency is likely to launch its final space shuttle flight.

2011年，美国航天航空局可能会发射最后一架航天飞机。

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NASA plans to retire the shuttle fleet, bringing US manned space flight to an end, for the forseeable future.

VOA: standard.2010.04.15

NASA officials cleared the flight after technicians fixed a hydrogen leak in the shuttle's fueling system, which delayed the launch from last week.

VOA: standard.2009.03.15

In fact, there had been evidence of leakage, what the engineers called "blowby, " on an earlier shuttle flight.

NPR: Challenger: Reporting a Disaster's Cold, Hard Facts

Ms. Ride was slated for a third shuttle flight when the Challenger exploded after taking off in 1986.

WSJ: Sally Ride, First U.S. Woman in Space, Dies

There was not going to be a Shuttle flight to fix this problem.

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